Backstage is where the mask comes off, so tradition reads it as the private self behind a public role. It can also stand for preparation, nerves and the work nobody else sees.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.